Build GeoScript with JDK 17

[hungd11]

JDK 17 has been out for several years. GeoScript should be made compatible with JDK 17 for increased availability across applications.

Detailed changes:

• Geoscript fails at runtime when used in Java 17 due to using the size parameter directly in the Color class. JDK 17 restricts usage of internal parameters to a greater degree. I've updated geoscript to build with JDK 17 and fixed the corresponding issue.
• Furthermore, Geoscript relies on some sun packages that are no longer exposed by default in JDK 17, so I had to manually expose those in the compile step as well.

[BrandonReuter]

Hi @jericks, not sure if you're still active so excuse the ping. This PR would be very useful for users to move to more modern JDKs. Thanks!